Unable to setup JWT SSO

We have configued the SSO JWT route, the apps are redireting however when we are finally sent back to Freshdesk we get the below error:

{“error”:“invalid_id”,“error_description”:“invalid identifier value”}

From what we can tell there is zero documentation or help available to know what this means, we have followed the documentation and triple checked all the values and redirects.

Any help would be greatly appreciated.